[time-nuts] Reverse-engineering LPRO

Bob Camp lists at rtty.us
Sun Feb 17 23:15:08 EST 2013


Hi

I'm thinking of a procedure like a radio alignment. Peak this, dip that, center this, set this to a quarter turn CCW past peak. The result won't be a factory spec unit. The hope is that you would have an "as good as it'll get" unit.

Bob

On Feb 17, 2013, at 10:50 PM, paul swed <paulswedb at gmail.com> wrote:

> Bob
> I do agree that all of the test points do make things handy. I have
> tinkered with the FRS units successfully. But it was really just guessing.
> I would add one point to consider. Most of us that have units have pretty
> old units and even if we had the actual procedure, from what I have seen
> things have shifted over the years. So aligning them to the spec might not
> actually work out. Though the alignment specs would be handy to see what
> they were thinking, sort of guidance at least.
> Regards
> Paul.
> 
> On Sun, Feb 17, 2013 at 10:34 PM, Bob Camp <lists at rtty.us> wrote:
> 
>> Hi
>> 
>> There *must* be an alignment procedure that sets these things up. They
>> didn't put all those test points in there just for the fun of it. I'm sure
>> that these units would work a bit better if we knew how to tweak them back
>> to the original alignment specs.
>> 
>> Bob
>> 
>> On Feb 16, 2013, at 6:10 PM, Magnus Danielson <magnus at rubidium.dyndns.org>
>> wrote:
>> 
>>> Fellow time-nuts,
>>> 
>>> Considering that LPROs is pretty popular, I am a bit surprised that I
>> have not seen any major reverse-engineering effort on the LPROs. I have the
>> self-compiled LPRO service document, which collects parts of schematics
>> from patents, but still.
>>> 
>>> My main reasons for asking is that I want to get a little better
>> overview of how they work, how I can tune them up and what signals is
>> available where. Naturally, always figuring if there is some interesting
>> tweaks to be done.
>>> 
>>> LRPO is just a traditional analogue rubidium, in compact format, sure,
>> but never the less.
>>> 
>>> I have noticed that different FPGAs have been used over time. Curious
>> about the various jumpers and connectors in it.
>>> 
>>> Cheers,
>>> Magnus
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